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CMakeLists.txt
CMakeLists.txt
 
 
README.md
README.md
 
 
display_test_main.c
display_test_main.c
 
 

README.md

FIS Display Test Firmware

Standalone firmware that cycles through all display modes supported by the main FIS bridge every 4 seconds. Use it to verify that the cluster display works and that every screen type (navigation text, caller ID, audio track, clock) is shown correctly.

No serial input or host is required. Demo content is generated on the Pico.

What it cycles through

Every 4 seconds the display advances to the next phase:

  • Phases 0-4: Nav text (distance + maneuver + street).
  • Phases 5-37: All 33 nav/status icons from fis_nav_icons.h (bitmap graphics, 64x64 px each).
  • Phase 38: Call (CALL / Test Caller).
  • Phase 39: Media (TRACK / Test Track).
  • Phase 40: Clock (local time + line 2).

After phase 40 it wraps to 0. Full cycle is 41 x 4 = 164 seconds.

Building

Same pinout and hardware as the main firmware (see firmware/README.md). Build the same way as the main firmware: set PICO_SDK_PATH (e.g. export PICO_SDK_PATH=$HOME/pico/pico-sdk or add to ~/.bashrc and source it). This project reuses the SDK import script from ../firmware/pico_sdk_import.cmake.

cd firmware-display-test
mkdir -p build
cd build
cmake ..
make -j4

Output: firmware-display-test/build/fis_display_test.uf2.

If the SDK is not installed, see firmware/README.md - Installing the Pico SDK.

Flashing

Use the same BOOTSEL procedure as the main firmware; only the UF2 file name differs.

  • Windows: Put Pico 2 W into BOOTSEL (hold BOOTSEL, plug USB, release). Copy fis_display_test.uf2 onto the RPI-RP2 drive in Explorer (or copy fis_display_test.uf2 D:\ with the correct drive letter). Full steps: firmware/README.md - Windows.
  • macOS: Put Pico 2 W into BOOTSEL, then cp fis_display_test.uf2 /Volumes/RPI-RP2/ or drag the file onto the RPI-RP2 volume in Finder. Prerequisites and details: firmware/README.md - macOS.
  • Linux: cp fis_display_test.uf2 /media/$USER/RPI-RP2/ (or your mount path) after entering BOOTSEL.

Use case

  • Bench test: Connect the PCB to a Passat B6 cluster (with correct level shifters and 3LB wiring). Power up; the display should cycle through all modes so you can check segments and contrast.
  • No host: No USB or Bluetooth host is needed; the Pico runs alone.
  • Same 3LB behaviour: Uses the same 3LB RX (idle detection) and TX (inject) logic as the main firmware, so you also verify bus timing and coexistence.

The main firmware sends the same frame types (radio text 0x81); this test only replaces the content source with fixed demo data and a 4 s timer.